(iv) arises due to the requirements of the Air Authority
 and/or the FAA or otherwise constitutes an obligation of
 Lessee under this Agreement.

 82


 (b) So long as no Default or Event of Default has occurred and is
 continuing, Lessee may remove any Equipment Change to the
 extent it is severable from the Aircraft and (i) such
 Equipment Change is not required by the Air Authority and/or
 the FAA and (ii) such severance will not adversely affect the
 value, utility, condition or airworthiness of the Aircraft as
 compared to value, utility, condition or airworthiness of the
 Aircraft immediately prior to such severance, assuming the
 Aircraft was of the value and utility and in the condition and
 repair required by the terms of this Agreement; and